package collection;

import java.util.ArrayList;
import java.util.Collection;

public class CollectionDemo {
    public static void main(String[] args) {
        Collection c=new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(1,2));
        System.out.println(c);

        Point p=new Point(1,2);
        boolean contains=c.contains(p);
        System.out.println("是否包含"+contains);

        c.remove(p);
        System.out.println(c);

        Collection cc=new ArrayList();
        Point pp=new Point(1,2);
        cc.add(pp);
        System.out.println("pp:"+pp);
        System.out.println("cc:"+cc);

        pp.setX(100);
        System.out.println("pp:"+pp);
        System.out.println("cc"+cc);

















        /*Collection c=new ArrayList();
        c.add("5");
        c.add("6");
        c.add("7");
        c.add("8");
        System.out.println(c);//[元素1.to String(),元素2.to String(),...]
        System.out.println("size："+c.size());
        System.out.println("是否为空集："+c.isEmpty());
        c.clear();
        System.out.println("集合已清空");
        System.out.println("size："+c.size());
        System.out.println("是否为空集："+c.isEmpty());
         */
    }
}
